GoPiGo2 Robot Starter Kit is perfect robot car if you want a smart robot with Raspberry Pi as its brains.

The Mini Wi-Fi Dongle attached to the Raspberry Pi eliminates the need for an ethernet cable and makes the robot functional as a remote controlled mobile car using the custom software “Raspbian for Robots” by Dexter Industries.

Every version of the Raspberry Pi can connect to the GoPiGo2 board,
turning it into a robot controller. GoPiGo2 is also compatible with Lego
Technic parts.

The robot is easy to assemble with a Philips head screw driver. If you have a Macbook Air without an ethernet jack, use an ethernet to USB adapter.